HSB758 amends Iowa Code to change how evidence and burdens of proof operate in property tax assessment protests and appeals. Beginning with assessment years that start on or after January 1, 2026, the bill provides that when a taxpayer (the complainant) offers evidence that the property's market value differs from the assessor’s value, the burden of proof shifts to the officials or persons defending the assessed valuation.
The bill also adopts a concrete test for inequitable assessments: an assessment is inequitable if the appraised value exceeds the median appraised value of a reasonable number of similar and comparable properties in the same geographical area.
The measure applies retroactively to January 1, 2026. Practically, the bill lowers the evidentiary hurdle for property owners to force assessors to justify valuations, while requiring assessors and local governments to assemble stronger, numerically defensible comparable data and to prepare for more contested administrative proceedings and potential revenue adjustments.
At a Glance
What It Does
The bill amends Iowa Code sections governing assessment appeals to shift the burden of proof to assessors for assessment years beginning Jan. 1, 2026 when a complainant presents evidence that market value differs from the assessor's value. It also defines an 'inequitable' assessment by comparing a property's appraised value to the median appraised value of a reasonable number of similar, comparable properties in the same area.
Who It Affects
County assessors, county attorneys, property assessment appeal boards, and local governments who must defend valuations; property owners, appraisal professionals, and attorneys who bring protests; and finance officers responsible for forecasting tax revenue.
Why It Matters
The change makes it easier for taxpayers to shift the evidentiary burden and could increase successful protests, contest activity, and downward valuation adjustments. The median-comparable rule injects a quantitative standard into equity claims but leaves key definitions (e.g., 'reasonable number') open, creating implementation and data-quality challenges.
More articles like this one.
A weekly email with all the latest developments on this topic.
What This Bill Actually Does
HSB758 rewrites who must prove what in Iowa property tax appeals. Under current law after 2018, a complainant had to offer competent evidence that market value differed from the assessor’s value before the burden shifted to officials defending the assessment.
The bill maintains that general structure but makes the threshold for shifting the burden broader for assessments beginning January 1, 2026: once a complainant offers evidence that market value differs, the assessor-side must carry the burden to justify the assessment.
Separately, the bill inserts a measurable standard into equity claims. Rather than relying solely on a qualitative comparison to 'other like property,' the bill treats an assessment as inequitable when the subject’s appraised value exceeds the median appraised value drawn from a reasonable sample of similar and comparable properties in the same geographic area.
The statute does not supply a numeric definition of 'reasonable number' or precise rules for selecting comparables, which will matter in practice.The act includes a retroactivity clause that ties the change to assessment years beginning on or after January 1, 2026, meaning appeals covering those assessment years can invoke the new evidentiary rule and the median-comparable test. The bill leaves intact the existing presumption around property classification after adjudication—classification determinations remain presumed unchanged for four subsequent assessment years, and a party asserting a change in use still bears that proof.Taken together, the provisions make it easier for owners to force a substantive defense of assessments while imposing new analytic expectations on assessors and local governments: they must maintain defensible valuation records, be prepared to present comparables and median calculations, and adjust internal workflows and budgets to respond to potentially more frequent or more successful protests.
The Five Things You Need to Know
For assessment years beginning on or after January 1, 2026, if a complainant offers evidence that market value differs from the assessor’s valuation, the burden of proof shifts to the officials or persons defending the contested valuation.
The bill eliminates any higher testimonial threshold (such as the pre-2018 two disinterested-witness rule) and makes the burden shift dependent on the complainant offering evidence rather than a specific form of proof.
An assessment is defined as inequitable when the property’s appraised value exceeds the median appraised value of a reasonable number of similar and comparable properties in the same geographical area, creating a numeric comparator test for equity claims.
The statute retains the presumption that a property classification adjudicated by the property assessment appeal board or a court remains unchanged for the next four assessment years, and places the burden of proving a change in use on the party asserting it.
The bill applies retroactively to January 1, 2026 for assessment years beginning on or after that date, allowing taxpayers to rely on the new standards in appeals covering those assessment years.
Section-by-Section Breakdown
Every bill we cover gets an analysis of its key sections.
Evidentiary burden shift for valuation disputes starting 2026
This amendment adjusts the timeline and trigger for shifting the burden of proof in valuation protests. For assessments starting January 1, 2026, the provision requires assessors (or other officials defending a valuation) to bear the burden once a complainant offers evidence that the market value differs from the assessor’s number. Practically, the change removes higher-formal-evidence thresholds that existed in earlier law and makes the burden-shift contingent on the complainant presenting any competent evidence of a value difference, which will change how hearings are litigated and what evidence parties must prepare.
Median-based test for inequitable assessments
This section narrows the 'not equitable' ground by specifying a median-comparator rule: an assessment is inequitable if the subject’s appraised value exceeds the median appraised value of a reasonable sample of similar and comparable properties in the same geographic area. The provision introduces an apparently objective metric to equity claims, but it leaves selection rules—how to define geographic area, what counts as 'similar and comparable,' and what constitutes a 'reasonable number'—to administrative practice or later case law.
Retroactivity to assessment years beginning Jan. 1, 2026
The bill expressly applies the changes retroactively to January 1, 2026 for affected assessment years. That means appeals and protests covering assessments that began on or after that date may be evaluated under the new burden and median-comparator rules, creating immediate operational implications for ongoing or recently filed cases and for county practices covering the 2026 assessment cycle.
This bill is one of many.
Codify tracks hundreds of bills on Finance across all five countries.
Explore Finance in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Property owners who contest valuations: They can more easily force assessors to substantively justify valuations once they produce evidence of a value disparity, lowering the procedural hurdle to shift the burden.
- Appraisal and tax practitioners representing taxpayers: The clearer burden-shift and median test create predictable levers (evidence of market value and comparable medians) that attorneys and appraisers can use strategically in protests and appeals.
- Owners of properties in districts with outlier appraisals: The median-comparator rule gives these owners a concrete statistical basis to claim inequity when a property’s appraised value sits above neighborhood medians.
Who Bears the Cost
- County assessors and appraisal staff: They must compile stronger supporting evidence, maintain datasets of comparables and median calculations, and allocate staff time to defend valuations more frequently and robustly.
- Local governments and taxing districts: Increased successful appeals or downward adjustments could reduce property tax revenues and complicate budget forecasting, at least until practices settle.
- Smaller counties and rural assessment offices: Those with limited appraisal resources face disproportionate compliance costs to generate defensible median analyses and to litigate more appeals.
Key Issues
The Core Tension
The central dilemma is balancing taxpayer access to meaningful relief—making it easier to compel assessors to justify valuations—against administrative fairness and capacity: the state can either lower procedural barriers for owners or preserve the presumption-bearing role of assessors, but doing both risks increased disputes, resource strain on local governments, and ambiguity over how to implement a median-comparable test consistently.
The bill trades a vague equitable-comparison standard for a numerical median test without defining several operationally critical terms. 'Reasonable number,' 'similar and comparable,' and the geographic boundary for selecting comparables are left unspecified, which shifts policymaking to implementing agencies, appeal boards, or the courts. Absent administrative guidance, parties will contest sample construction and comparability—potentially increasing litigation over methodology rather than underlying values.
The burden-shift mechanism reduces the complainant’s evidentiary threshold to trigger an assessor’s obligation to prove the valuation; that invites strategic behavior where minimal or low-cost evidence is submitted to force a full defensive record from assessors. For assessors and counties, the practical effect will be additional staff hours, new data management needs, and possibly more consultant expenses.
Retroactive application to January 1, 2026 accelerates these demands and raises fairness and notice concerns for offices already finalizing valuation cycles for that year.
Try it yourself.
Ask a question in plain English, or pick a topic below. Results in seconds.